DE2408612C2 - Unwinding device for the intermittent unwinding of continuous winding material from a drum - Google Patents

Description

Wire binding element 16 on the sensor 34 exceeds the action of the counterweights 36, so that the sensor tilts down and the microswitch 32 burns, whereby the motor is switched off. If the binding machine needs another section of material, the wire binding element 16 is pulled taut and lifted from the feeler 34. The counterweights 36 then pivot the sensor 34 upwards, closer, the microswitch 32 and switch on the motor. As a result, the feed rollers 20 and 22 rotate and drive the Drum 10, so that a further length of the wire binding element 16 is made available.

As an alternative solution, the sensor 34 can be replaced by a or several arms are replaced which carry a counterweight at one of their ends. With the arm or the The microswitch 32 is in communication with the poor. The arrangement is made so that they are similar How the sensor 34 works

The motor can be connected to both feed rollers in order to rotate them. Apart from the motor can also only be connected to a single feed roller in order to only rotate this.

For this purpose 2 sheets of drawings

25th

30th

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65

Claims (3)

1 2 to shape that it is suitable for intermittent unwinding claims: of sensitive material against tearing or stretching by tensile forces 1. Unwinding device for intermittent unwinding The solution to the problem is angegekeln in claim 1 of continuous winding material from a drum 5. The subclaims relate to advantageous further mel, with pre-configurations that can be driven in the unwinding direction. thrust rollers and one of the weight of a free hanging By the invention, the advantage is achieved that for Lowing loop of the winding material acted upon purposes of the intermittent unwinding of the material Switching device that depends on the drive rollers by switching the control on and off the shortening or lengthening 10 drifts abruptly between complete standstill and full Looping the feed rollers controls the drive speed accelerated and decelerated characterized in that the feed rollers (20 can be without the winding material the corresponding and 22) must be able to withstand the tensile forces resting on them, as the drive shaft drum (10) attack and that the switching devices do not rest on the winding material but on the one on them (32, 34) attack the drive of the feed rollers (20 15 lowing drum. The winding material itself and 22) switches on and off therefore does not need any pulling force, neither continuously 2. Unwinding device according to claim 1, characterized before still due to the acceleration, aufzuehgekisiert that each feed roller (20,22) to men. Another advantage of the two according to the invention Each end has a guide groove (24) or a direction is that the only frustoconical on the feed Guide flange (28) with the drum on top of it is simply lifted off and neighboring shoulder (30) and that the drum can be exchanged for a full drum mel (10) with their end plates (14) on the guide and that the device also drums different Rungsnuten (24) or the shoulders (30) rests diameter can accommodate. 3. Unwinding device according to claim 1 with one embodiment of the invention will be based on nem explained in more detail on the weight of the free-hanging loop of 25 of the drawing It shows Loaded winding material, loaded by a restoring force F i g. 1 with a plan view of an unwinding device open feeler and one of the feeler in a first embodiment of feed rollers; Loading or unloading through the loop beta F i g. Figure 2 is a side view of an unwinder saturated microswitch, characterized in that with a second embodiment of feed roller the sensor (34) is located lower than the drum (10). net is. The illustrated unwinding device can be used to length-wise a wire binding element to a front direction to guide the piles of perforated sheets binds in book form. 35 Fig. 1 shows a drum 10 with a central part 12, The invention relates to an unwinding device of the circular end plates 14 and on which one of the type of wire binding element 16 specified in the preamble of claim 1 is wound for unwinding cardboard from a roller mounted by means of a shaft which is curved into a series of hairpins. The 40 prongs on the web itself are bent, onto which the feed rollers engaging the sheets to be bound are continuously attached or threaded. The wire is driven around, and to achieve an interrupted form of a continuous, U-shaped paper stretching of the web, either the frictional force of the feed rollers acting on the web is temporarily wound onto the drum 10 so that the frictional force of the feed rollers engaging the web or not interlock can,
the drive speed of the feed rollers is reduced. Here, the wound material is fed through the periodic feed rollers 20 and 22, the acceleration and deceleration form applied to it in the embodiment according to FIG. 1 at each end with a V-shaped guiding forces and a guide groove 24 provided by slippage on the feed roller flanges, in which zen is considerably stressed. The known device, the end plate 14 of the drum 10 rests. The contact is therefore only problem-free if the winding material 50 between the groove 24 and the end plate 14 is relatively insensitive and / or the speed is required to cause the drum 10 to rotate,
changes are not too abrupt. F i g. 2 shows a modified embodiment. From AT-PS 2 71 271 there is a winding device with a feed roller 22, in which this is at both ends, in which the drum carries on two driven truncated cone-shaped guide flanges 28 around which the zen rests directly and by the rotation thereof on the end plates 14 of the drum 10, it is driven to fall from the. To be prevented by an additional rotating and unloading feed roller. Furthermore, a revolving device is provided to increase or decrease the weight load on the other shoulder 30 on the inside of the guide surface 28 of the drive rollers through the drum in order to make contact with the face plate 14. Facilities for intermittent removal or improvement. With this device 60 the winding material is wound up. The feed rollers 20 and 22 are intermittently not provided. The US-PS 31 44 032 shows a rend driven by a motor, not shown, too Rotary drive for drums, in which the drum is controlled by a device with a micro- two driven rollers rests directly, with switch 32 and a sensor 34 being used. The probe 34 However, this device for degreasing the empty is at a lower level than the drum 10, so that the Drum and not for winding or unwinding wik- 65 unwound from the drum wire binding element 16 kelgut serves. falls on the feeler. The feeler 34 carries on each The invention is based on the object, one of its longitudinal edges an arm with one on its winding device of the type mentioned so from the end arranged counterweight 36. The weight of the